A generalized approach to modeling radiation pattern measurement methods for high-power LEDs

2010 ◽  
Author(s):  
Gao-Wei Chang ◽  
Chia-Cheng Liao ◽  
Yung-Chang Chen
Keyword(s):  
Radiation Pattern ◽  
High Power ◽  
Measurement Methods

scholarly journals A Reconfigurable Graphene Nanoantenna on Quartz Substrate

2020 ◽  
Vol 19 (5) ◽  
pp. 379-383
Author(s):  
Yanghua Gao ◽  
Weidong Lou ◽  
Hailiang Lu
Keyword(s):  
Reflection Coefficient ◽  
Radiation Pattern ◽  
High Power ◽  
Quartz Substrate ◽  
Miniaturized Antenna ◽  
Thz Applications ◽  
Scattering Losses ◽  
Dynamic Frequency ◽  
Operation Frequency ◽  
Thz Antennas

In the terahertz (THz) band, conventional metallic antennas are virtually infeasible, due to the low mobility of electrons and huge attenuation. The existing metallic THz antennas need a high power to overcome scattering losses, and tend to have a low antenna efficiency. Fortunately, graphene is an excellent choice of miniaturized antenna in millimeter/THz applications, thanks to its unique electronic properties in THz band. Therefore, this paper presents two miniaturized reconfigurable graphene antennas, and characterizes their performance in terms of frequency reconfiguration, omnidirectional radiation pattern, and radiation efficiency. The proposed graphene antennas were printed on a quartz substrate, and simulated on CST Microwave Studio. The results show that the excellence of the proposed antennas in reflection coefficient, dynamic frequency reconfiguration (DFR), and omnidirectional radiation pattern. The operation frequency of the two antennas varies from 0.74 to 1.26 THz and from 0.92 to 1.15 THz, respectively. The proposed antennas have great prospects in wireless communications/sensors.

Analysis of transient radiation pattern of a high‐power bipolar short‐pulsed array antenna

2017 ◽  
Vol 11 (14) ◽  
pp. 2043-2048
Author(s):  
Jae Sik Kim ◽  
Seung Hun Cha ◽  
Young Joong Yoon ◽  
Jiheon Ryu ◽  
Jin Soo Choi
Keyword(s):  
Radiation Pattern ◽  
High Power ◽  
Array Antenna ◽  
Transient Radiation

Decay Mechanisms of Radiation Pattern and Optical Spectrum of High-Power LED Modules in Aging Test

2009 ◽  
Vol 15 (4) ◽  
pp. 1156-1162 ◽  
Author(s):  
Chun-Chin Tsai ◽  
Ming-Hung Chen ◽  
Yi-Chung Huang ◽  
Yi-Cheng Hsu ◽  
Yuan-Tsun Lo ◽  
...  
Keyword(s):  
Radiation Pattern ◽  
High Power ◽  
Optical Spectrum ◽  
Aging Test ◽  
High Power Led
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